866386 has 4 divisors (see below), whose sum is σ = 1299582. Its totient is φ = 433192.

The previous prime is 866353. The next prime is 866389. The reversal of 866386 is 683668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 680625 + 185761 = 825^2 + 431^2 .

It is not an unprimeable number, because it can be changed into a prime (866389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216595 + ... + 216598.

2⁸⁶⁶³⁸⁶ is an apocalyptic number.

866386 is a deficient number, since it is larger than the sum of its proper divisors (433196).

866386 is a wasteful number, since it uses less digits than its factorization.

866386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433195.

The product of its digits is 41472, while the sum is 37.

The square root of 866386 is about 930.7985818640. The cubic root of 866386 is about 95.3316570469.

The spelling of 866386 in words is "eight hundred sixty-six thousand, three hundred eighty-six".